﻿428 ANODONTA 



i^ulati<jn a little below the median line; surface sculptured with 

 numerous concentric ridges ; epidermis dark brown or black, 

 shining or a little dusky ; dorsal and ventral lines nearly paral- 

 lel, the latter a little incurved in the middle ; nacre bluish-white, 

 iridescent. 



Length icK), height 56. diam. 34 mm. 



Type locality. Topeka. Kansas. Alsoi Limestone Gap, Indian 

 Territory. 

 Anodonta danielsii Jj.a, i'r. Ac. X. Sci. I'liila., II, 1858, p. 



139; Jl. Ac N. Sci. Phila., l\\ i860, p. 365. pi. lxiii, fig. 



190; Obs., VIII, i860, p. 47. pi. i,\iii, fig. 190. — CivESSiN, 



Conch. Cab. Anc, 1873, p. 108, pi. wxiii, figs, i, 2. — 



Simpson, Sjm., 1900, p. 645. 

 Margaron I Anodonta) danielsii Lka, Syn., 1870, p. 78. 

 Anodon danielsii SowiCKiiv, Conch. Icon., X\'II, 1870, pi. 



XXXVI, fig. 148. 

 Margaritana danielsii P-"n:TEi., Conch, v^am.. Ill, iScjo, p. 173. 



A thin, concentrically sculptured, very dark form with the 

 base line a little incurved. I found what I have no dotibt is 

 this species at Limestone Gap, Indian Territory, in pools in a 

 rocky stream. 



Anodonta opaca Lea. 



Shell long elliptical, subinflated to inflated, moderately 

 strong, inequilateral, with full, high beaks, whose sculpture 

 consists of doubly-looi>ed, nodttlous ridges ; posterior ridge 

 low, generally double, ending behind in a biangulation at the 

 median line ; anterior end rounded, scarcely angled above ; 

 posterior wing very low. scarcely angled behind ; base line 

 straight or slightly incurved ; epidermis dark, smoky or ashy- 

 brown, sometimes banded, subshining ; nacre bluish-white, hav- 

 ing a soft, silverv tint, sometimes yellowish in the cavity. 



Length 108. height 62. diam. 43 mm. 



Louisiana ; Mississippi ; north to Kansas. 



Type locality, near N^ew Orleans and T^ittle Rock, Ark. 



